Peters



P. M. JAMES.- v GLASS CHIMNEY, GLOBE, &o.

No. 244,246. Patented July 12,1881.

N PETERS. Phowumo n mr. Wnhingmn. DC,

UNITED STATES PATENT O FICE.

FRANCIS M. JAMES, OF BIG RAPIDS, MICHIGAN, ASSIGNOR OF ONE-HALF TO JOSEPH W. FEARNS, OF SAME PLACE.

GLASS CHIMNEY, GLOBE, etc.

SPECIFICATION formingpart of Letters Patent No. 244,246, dated July 12, 1881.

I Application filed August 29, 1879.

1'0 all whom it may concern:

Be it known that I, FRANCIS M. JAMES, of city of Big Rapids, in the county of Mecosta and State of Michigan, have invented a new 5 and useful Improvement in the Construction and Manufacture of Glass Chimneys, Glass Globes, and Glass Tubes used on Lamps and Lanterns, of which the following is a specification.

This invention has relation to glass lampchimneys and the like; and it consists of an article of this class having a lap-joint extending from top to bottom of the article at one side only of the same; and it further consists in the improved process by which said article is formed, as will be hereinafter fully described, and particularly pointed out in the claims.

Figure l is a perspective view of a lampchimney embodying my improvements. Fig. 2 is a. lateral sectional view of Fig. 1. Fig. 3 is a vertical sectional view, and Fig. 4 is a cross section on the line B in Fig. 3.

The object of the invention is to allow the chimney or other article, while becoming heated, to, expand, and while becoming cooled to contract, and thus avoid breakage during these operations, and at the same time to produce ajoint that will not permit a lateral current to interfere with the draft and cause the chimney to smoke.

Referring by letters to the accompanying drawings, A designates a lamp-chimney, and a the lap-joint, extending from top to bot-tom thereof, at one side of the same.

The process by which I construct this chim-. ney and analogous articles is as follows: I form the chimney in two parts in molds, each half thereof having one plain edge and an edge by which the lap-joint may be formed when the parts are united. I then reheat the plain edges of the parts and stick them to gether. The edges forming the lap-joint are not reheated nor stuck together.

A lamp-chimney constructed in this manner will expand under heat and contract while cooling without danger of breaking, and while expanded will not open at the joint sufficiently to permit a lateral current to the chimney. Lamp-chimneys have been provided with a single vertical slit in one side, passing entirely through the same, and an incision passing partially through the material has also been used at one side thereof. Two slits have been made at opposite sides of the chimney, and spiral springs fitting in grooves near the top and bottom have been employed to hold the parts together and permit expansion and contraction.

Chimneys formed of rings of various colors of glass intersected at their edges have also been employed in signal-lanterns. None of these constructions are claimed herein.

What I claim, and desire to secure by Letters Patent, is-

1. Alamp-chimney or the like having a vertical lap-joint, a, extending from top to bottom thereof, substantially as and for the purposes set forth.

2. The herein-described process of forming lamp-chimneys and the like, eonsistingin first forming the chimney in two parts, in molds, reheating one edge of each of the parts, and sticking the heated edges together, substantially as set forth.

Dated March 24, 1879.

FRANCIS M. JAMES.

Witnesses W. W. CARPENTER, E. O. CARPENTER. 

